You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@struts.apache.org by Bart Busschots <ba...@so-4pt.net> on 2006/08/01 20:54:25 UTC
OK ... I'm almost there ..... just not quite yet
OK ... I have a simple two-step for for allowing a user of our system (a
teacher) to create a group of students in our system. The first step
asks the teacher to enter some basic information about the group as a
whole, specifically, the name, the group type (a dropdown), a group
description (a text area) and the number of students in the group. The
second step then asks the teacher to enter the names of all the
students. The obvious thing to note is that the number of text areas on
the second page is dynamic. So, after some messing around I decided to
store that information as a list of Strings in the form bean so my form
looks like this in strutsconfig:
<form-bean name="createStudentGroupForm"
type="org.apache.struts.validator.DynaValidatorForm">
<form-property name="groupName" type="java.lang.String" />
<form-property name="noStudents" type="java.lang.String" />
<form-property name="groupType" type="java.lang.String" />
<form-property name="wikiText" type="java.lang.String" />
*<form-property name="studentNames" type="java.lang.String[]" />*
</form-bean>
The first form submits to an action that populates the studentNames
field like so:
//get the dynamic form
DynaValidatorForm theForm = (DynaValidatorForm)form;
//get the details from the form
String groupType = (String)theForm.get("groupType");
int numStudents = Integer.parseInt(((String)theForm.get("noStudents")));
//prepare the list of default student names
String students[] = new String[numStudents];
for(int i = 0; i < numStudents; i++) {
students[i] = "Student " + (i + 1);
}
//insert into the form
theForm.set("studentNames", students);
I then try to render the text areas in my JSP like so:
<html:form action="/mentor/createNamedStudentGroup"
styleClass="vtie_form" onsubmit="encodeNames()">
<ul class="form_element_list">
<jsp:useBean id="createStudentGroupForm" scope="session"
type="org.apache.struts.validator.DynaValidatorForm" />
<logic:iterate id="student" name="createStudentGroupForm"
property="studentNames">
<li><html:text property="studentNames" indexed="true" /></li>
</logic:iterate>
</ul>
I do get out 5 text areas as you would expect but the values are messed
up. Here is the source generated:
<li><input type="text" name="org.apache.struts.taglib.html.BEAN[0].studentNames" value="[Ljava.lang.String;@1a175b" /></li>
<li><input type="text" name="org.apache.struts.taglib.html.BEAN[1].studentNames" value="[Ljava.lang.String;@1a175b" /></li>
<li><input type="text" name="org.apache.struts.taglib.html.BEAN[2].studentNames" value="[Ljava.lang.String;@1a175b" /></li>
<li><input type="text" name="org.apache.struts.taglib.html.BEAN[3].studentNames" value="[Ljava.lang.String;@1a175b" /></li>
<li><input type="text" name="org.apache.struts.taglib.html.BEAN[4].studentNames" value="[Ljava.lang.String;@1a175b" /></li>
As you can see I seem to be getting close to what I want but I'm not
there just yet :(
Any pointers of where I've gone wrong would be greatly appreciated.
Thanks,
Bart.
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: OK ... I'm almost there ..... just not quite yet
Posted by kalpesh modi <mo...@yahoo.com>.
You can create a Student object with say FirstName, LastName etc. The form will have a list of Student objects. I usually do with the ActionForm. I havent tried it with DynaActionForm.
On the first page, when the user enters the number of students (say 5) , create a list of 5 student objects in your action class and forward it to the corresponding JSP. Iterate through the list, to view empty fields. I used nested tag for this. I think you can use the JSTL c:forEach tag also for this.
HTH.
Thanks,
-Kalpesh
---------------------------------
Groups are talking. We´re listening. Check out the handy changes to Yahoo! Groups.
Re: OK ... I'm almost there ..... just not quite yet
Posted by David Gagnon <dg...@siunik.com>.
It`s been a while since I worked with that .. but I think you missing
the name attribute in you text tag i.e.:
<html:text name="student" property="studentNames" indexed="true" />
Regards
/David
Bart Busschots wrote:
> OK ... I have a simple two-step for for allowing a user of our system
> (a teacher) to create a group of students in our system. The first
> step asks the teacher to enter some basic information about the group
> as a whole, specifically, the name, the group type (a dropdown), a
> group description (a text area) and the number of students in the
> group. The second step then asks the teacher to enter the names of all
> the students. The obvious thing to note is that the number of text
> areas on the second page is dynamic. So, after some messing around I
> decided to store that information as a list of Strings in the form
> bean so my form looks like this in strutsconfig:
>
> <form-bean name="createStudentGroupForm"
> type="org.apache.struts.validator.DynaValidatorForm">
> <form-property name="groupName" type="java.lang.String" />
> <form-property name="noStudents" type="java.lang.String" />
> <form-property name="groupType" type="java.lang.String" />
> <form-property name="wikiText" type="java.lang.String" />
> *<form-property name="studentNames" type="java.lang.String[]" />*
> </form-bean>
>
> The first form submits to an action that populates the studentNames
> field like so:
>
> //get the dynamic form
> DynaValidatorForm theForm = (DynaValidatorForm)form;
>
> //get the details from the form
> String groupType = (String)theForm.get("groupType");
> int numStudents =
> Integer.parseInt(((String)theForm.get("noStudents")));
>
> //prepare the list of default student names
> String students[] = new String[numStudents];
> for(int i = 0; i < numStudents; i++) {
> students[i] = "Student " + (i + 1);
> }
>
> //insert into the form
> theForm.set("studentNames", students);
>
> I then try to render the text areas in my JSP like so:
>
>
> <html:form action="/mentor/createNamedStudentGroup"
> styleClass="vtie_form" onsubmit="encodeNames()">
>
> <ul class="form_element_list">
> <jsp:useBean id="createStudentGroupForm" scope="session"
> type="org.apache.struts.validator.DynaValidatorForm" />
> <logic:iterate id="student" name="createStudentGroupForm"
> property="studentNames">
> <li><html:text property="studentNames" indexed="true" /></li>
> </logic:iterate>
> </ul>
>
> I do get out 5 text areas as you would expect but the values are
> messed up. Here is the source generated:
>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[0].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[1].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[2].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[3].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[4].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
>
> As you can see I seem to be getting close to what I want but I'm not
> there just yet :(
>
> Any pointers of where I've gone wrong would be greatly appreciated.
>
> Thanks,
>
> Bart.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: OK ... I'm almost there ..... just not quite yet [resolved]
Posted by Bart Busschots <ba...@so-4pt.net>.
In case anyone else comes across this thread in the future and was
wondering what the solution was, it is just a very small change in the
JSP code. The correct code reads:
<ul class="form_element_list">
<jsp:useBean id="createStudentGroupForm" scope="session"
type="org.apache.struts.validator.DynaValidatorForm" />
<logic:iterate id="student" name="createStudentGroupForm"
property="studentNames" indexId="i">
<li><html:text property="studentNames[${i}]" /></li>
</logic:iterate>
</ul>
Now, if I can get validator beaten into shape I have a working 'clean'
solution to my problem rather than a nasty hack so it's been a
productive afternoon! Cheers for the various replies this afternoon ....
they really helped steer me in the right direction.
Bart.
Bart Busschots wrote:
> OK ... I have a simple two-step for for allowing a user of our system
> (a teacher) to create a group of students in our system. The first
> step asks the teacher to enter some basic information about the group
> as a whole, specifically, the name, the group type (a dropdown), a
> group description (a text area) and the number of students in the
> group. The second step then asks the teacher to enter the names of all
> the students. The obvious thing to note is that the number of text
> areas on the second page is dynamic. So, after some messing around I
> decided to store that information as a list of Strings in the form
> bean so my form looks like this in strutsconfig:
>
> <form-bean name="createStudentGroupForm"
> type="org.apache.struts.validator.DynaValidatorForm">
> <form-property name="groupName" type="java.lang.String" />
> <form-property name="noStudents" type="java.lang.String" />
> <form-property name="groupType" type="java.lang.String" />
> <form-property name="wikiText" type="java.lang.String" />
> *<form-property name="studentNames" type="java.lang.String[]" />*
> </form-bean>
>
> The first form submits to an action that populates the studentNames
> field like so:
>
> //get the dynamic form
> DynaValidatorForm theForm = (DynaValidatorForm)form;
>
> //get the details from the form
> String groupType = (String)theForm.get("groupType");
> int numStudents =
> Integer.parseInt(((String)theForm.get("noStudents")));
>
> //prepare the list of default student names
> String students[] = new String[numStudents];
> for(int i = 0; i < numStudents; i++) {
> students[i] = "Student " + (i + 1);
> }
>
> //insert into the form
> theForm.set("studentNames", students);
>
> I then try to render the text areas in my JSP like so:
>
>
> <html:form action="/mentor/createNamedStudentGroup"
> styleClass="vtie_form" onsubmit="encodeNames()">
>
> <ul class="form_element_list">
> <jsp:useBean id="createStudentGroupForm" scope="session"
> type="org.apache.struts.validator.DynaValidatorForm" />
> <logic:iterate id="student" name="createStudentGroupForm"
> property="studentNames">
> <li><html:text property="studentNames" indexed="true" /></li>
> </logic:iterate>
> </ul>
>
> I do get out 5 text areas as you would expect but the values are
> messed up. Here is the source generated:
>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[0].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[1].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[2].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[3].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
> <li><input type="text"
> name="org.apache.struts.taglib.html.BEAN[4].studentNames"
> value="[Ljava.lang.String;@1a175b" /></li>
>
> As you can see I seem to be getting close to what I want but I'm not
> there just yet :(
>
> Any pointers of where I've gone wrong would be greatly appreciated.
>
> Thanks,
>
> Bart.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org